Electric wire insulator support



April 8, 1952 D. D. HARDING ELECTRIC WIRE INSULATOR SUPPORT Filed Dec. 27, 1948 INVENTOR.

Patented Apr. 8, 1952 UNITED STATES ,PATENT OFFICE ELECTRIC WIRE INSULATOR SUPPORT Donald 1). Harding Avilla, Ind.

Application December 27, 1948, Serial No. 67,478

1 Claim. (Cl. 248-221) This invention relates to improvements in electric wire insulator supports of that type wherein the insulators are mounted upon pins arranged and secured upon cross-arms on a pole.

In ordinary practice poles are erected that have secured to their upper portions wooden crossarms upon which pins are secured in various ways to support the insulators. Generally, there has been difficulty in maintaining stability between the insulator pins and the cross-arms due to varying climatic conditions. For instance, splitting of the cross-arms frequently occurs because the fastening means used in attaching the pins to the cross-arms become loose or the pins as well as the cross-arms deteriorate, both of which being commonly made of wood.

In the instant invention, the insulator pins are made of cast metal, such as aluminum. and are secured to the cross-arms by screws so arranged as to reduce the likelihood of splitting the grain of the wooden cross-arms.

An object of the invention is to afford insulator pins, light of weight and of great strength, so designed as to provide substantial seating of the pins on the cross-arms, and means for attaching the pins in selected places spaced apart from each other in a manner to avert splitting the grain of the cross-arms to which the pins are attached.

Other objects and advantages of the invention appear in the following description.

An illustrative embodiment of the invention members 9 and I0, constitute a saddle adapted the ordinary wooden cross-arm of a telegraph.

to be positioned astride a cross-arm I! such as pole (not shown). The bottom of the base 8 preferably is concave and conforms with the con- 'vexity of the top of the cross-arm. so as to become firmly seated and is held thereon when the side members are secured against the opposite sides of the cross-arm by means of nails or screws I3.

The base 8 and the side members constitute a saddle that is disposed astride the cross-arm and fits thereon when in place, the side members other and out of axial alinement, the purpose being to avoid splitting the cross-arm by the nails or screws l3 that are driven into the cross-arm to secure the side members in place.

By this arrangement, the insulating pin structures are firmly secured to the exterior walls of the crossarms seated thereon, which affords better anis shown in the accompanying drawings in shown in Fig. 4.

The illustrative embodiment of the invention consists of a hollow casting, preferably of aluminimum, shaped to form a tapered tubular pin 5, the upper end of which is threaded and has a longitudinal slot I extending through its threaded portion. The lower end of the pin 6 has a wide chorage for the insulator supporting pins without weakening the cross-arms which is occasioned in the ordinary practice of boring holes through the cross-arms for accommodation of th stems of the usual wooden or metal pins.

In Figs. 4 and 5 are shown pins similar to those shown in the other figures of the drawings. In this instance, the side members 9-|0 extending from the base 8 that has an upstanding pin 6, as in the former instance, and the nail holes H in the side members are staggered both vertically and horizontally respecting each other, so that the nails or screws I3 when driven into the cross-arms extend into separate grain laminae of the wooden cross-arms, thus is avoided splitting or shattering of the cross-arms.

In use, the fixtures are shaped so their saddles normally fit the adjacent walls of the cross-arms snugly, and when in place are secured by driving nails or screws through the holes in the distal ends of the side members into the crossarms at corresponding levels spaced apart from each other.

An advantage of the invention is that the fixtures, once secured upon the cross-arms, may

- readily be removed therefrom and replaced upon integral base 8 provided with downwardly extending side members 9 and lengthseach having in its distal end a nail. or screw hole I I. The base 8, together with its side.

ID of different I of, in the ordinary manner, may be spaced apart I other cross-arms, as in making repairs or renewals. And another advantage is that the fixtures for supporting the insulators (not shown) that are mounted on the threaded ends therefrom each other in selected positions on the cross-arms and secured in place thereon irrespective or any holes that are bored for reception of the ordinary insulator pins.

Variations from the particular construction above disclosed may be resorted to by the exercise of skill in the art, without departure from the spirit or scope of the invention.

What I claim is:

An insulator pin consisting of a hollow casting of non-corrosive and non-magnetic metal, shaped to afford a saddle with a wide base adapted to fit astride a cross-arm, said saddle having downwardly extending staggered side members of diflerent lengths provided with nail holes located respectively in different vertical and horizontal planes in their distal ends, and means driven through said holes into said cross-arm to secure said casting in place.

DONALD D. HARDING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 964,376 Blackburn July 12, 1910 1,000,389 Ette Aug. 15, 1911 1,219,746 Keppler Mar. 20, 1917 1,597,243 Newman et al Aug. 24, 1926 1,738,875 Dufiy Dec. 10, 1929 FOREIGN PATENTS Number Country Date France Mar. 22, 1921 all r 

